named dzhokhar tsarnaev. the younger brother of tamerlan tsarnaev, he's dead. these are the two suspects identified by the fbi in the video and still photos that were released yesterday. massive manhunt underway right now for this younger 19-year-old. he was a student at the university of massachusetts dartmouth. no relation to dartmouth college. university of massachusetts dartmouth here in massachusetts. he's been speaking to a lot of his associates, friends, he was a wrestler on the wrestling team. he seemed to be a normal kid and all of a sudden we're learning maybe not so normal. >> wolf, i had kept a list as we were interviewing people who knew the younger brother. the older brother, there have not been any people we've been speaking to. the older brother seems to be more reclusive. the younger brother, we've heard again and again positive things about this young man. and yet he has done a who ahorr thing. what changed and how did this happen? we'll take a quick break and be back in just a moment. 800-345-20 tdd#: 1-800-345-2550 and the streetsmart edge t